18 F-FDG PET/CT显像在评价不同病理亚型淋巴瘤疗效方面的价值

目的：探讨18 F-脱氧葡萄糖(18 F-FDG) PET/CT在不同病理亚型淋巴瘤疗效的评估价值。方法收集我科近4年来治疗前后均行PET/CT检查的淋巴瘤患者资料,同时根据自愿原则随机选取治疗前已行PET/CT检查的淋巴瘤患者,于治疗2~4个疗程后再次行PET/CT检查。回顾性分析并比较43例不同病理亚型淋巴瘤病灶(包括淋巴结病灶和结外灶)治疗前最大标准摄取值( SUVmax )、滞留指数( RI)和治疗后的SUVmax并进行统计学分析。所有病例随访至少3个月。结果治疗前霍奇金淋巴瘤( HL)与非霍奇金淋巴瘤( NHL)的病灶间平均SUVmax比较及RI比较差异无统计学意义。治疗前不同病理亚型的NHL淋巴瘤病灶平均SUVmax及RI与NHL的侵袭性呈正相关性,与淋巴瘤的分期无明显相关;治疗后43例患者达到完全缓解23例,部分缓解16例,疾病稳定状态1例,复发或进展3例。治疗前后淋巴瘤病灶的SUVmax差异有统计学意义(P<0．01)。结论18 F-FDG PET/CT显像对淋巴瘤患者治疗前后病灶平均SUVmax及RI的比较分析能有效评价疗效、判断预后,并为进一步治疗方案制定提供帮助和指导。     

18F-FDG uptake on PET correlates with biological potential in early oral squamous cell carcinoma

Conclusion: The maximum standardized uptake value (SUVmax) of early oral squamous cell carcinoma (OSCC) may have a role as an imaging biomarker for assessment of malignant potential, including cell metabolism and angiogenesis. Objective: The usefulness of ¹⁸F-fluorodeoxyglucose positron emission tomography (FDG-PET) has been proven in various cancers, including OSCC. Moreover, in several carcinomas, the SUVmax of the tumor has been shown to correlate with the histological type, tumor stage, differentiation, and prognosis. Here, we investigated whether the SUVmax of early OSCC was associated with the biological features. Methods: Twenty-seven patients with newly diagnosed early OSCC who underwent preoperative FDG-PET and curative surgical resection were included in this study. Tumor sections were stained by immunohistochemistry for glucose transporter 1 (GLUT1), L-type amino acid transporter 1 (LAT1), CD98, microvessels (CD34), cell proliferation marker (Ki-67), and cell cycle regulator (p53). The correlation between SUVmax and clinicopathological findings or the expression level of these molecules was analyzed. Results: SUVmax of primary OSCC was significantly higher in patients with T2 stage. Moreover, patients whose tumors showed vascular invasion had a tendency to show higher SUVmax. A significant correlation was observed between SUVmax and the expression of LAT1 or microvessel density.     

Relationship between 18F-FDG PET/CT Semi-Quantitative Parameters and International Association for the Study of Lung Cancer,American Thoracic Society/European Respiratory Society Classification in Lung Adenocarcinomas

ObjectiveTo investigate the relationship between ¹⁸F-FDG PET/CT semi-quantitative parameters and the International Association for the Study of Lung Cancer, American Thoracic Society/European Respiratory Society (IASLC/ATS/ERS) histopathologic classification, including histological subtypes, proliferation activity, and somatic mutations.Materials and MethodsThis retrospective study included 419 patients (150 males, 269 females; median age, 59.0 years; age range, 23.0–84.0 years) who had undergone surgical removal of stage IA–IIIA lung adenocarcinoma and had preoperative PET/CT data of lung tumors. The maximum standardized uptake values (SUVmax), background-subtracted volume (BSV), and background-subtracted lesion activity (BSL) derived from PET/CT were measured. The IASLC/ATS/ERS subtypes, Ki67 score, and epidermal growth factor/anaplastic lymphoma kinase (EGFR/ALK) mutation status were evaluated. The PET/CT semi-quantitative parameters were compared between the tumor subtypes using the Mann–Whitney U test or the Kruskal–Wallis test. The optimum cutoff values of the PET/CT semi-quantitative parameters for distinguishing the IASLC/ATS/ERS subtypes were calculated using receiver operating characteristic curve analysis. The correlation between the PET/CT semi-quantitative parameters and pathological parameters was analyzed using Spearman’s correlation. Statistical significance was set at p < 0.05.ResultsSUVmax, BSV, and BSL values were significantly higher in invasive adenocarcinoma (IA) than in minimally IA (MIA), and the values were higher in MIA than in adenocarcinoma in situ (AIS) (all p < 0.05). Remarkably, an SUVmax of 0.90 and a BSL of 3.62 were shown to be the optimal cutoff values for differentiating MIA from AIS, manifesting as pure ground-glass nodules with 100% sensitivity and specificity. Metabolic-volumetric parameters (BSV and BSL) were better potential independent factors than metabolic parameters (SUVmax) in differentiating growth patterns. SUVmax and BSL, rather than BSV, were strongly or moderately correlated with Ki67 in most subtypes, except for the micropapillary and solid predominant groups. PET/CT parameters were not correlated with EGFR/ALK mutation status.ConclusionAs noninvasive surrogates, preoperative PET/CT semi-quantitative parameters could imply IASLC/ATS/ERS subtypes and Ki67 index and thus may contribute to improved management of precise surgery and postoperative adjuvant therapy.     

Limitations and benefits of FDG-PET/CT in NF1 patients with nerve sheath tumors: A cross-sectional/longitudinal study

The purposes of this study were to re-confirm the usefulness of PET/CT in the differentiation of benignity/malignancy of neurogenic tumors in NF1 patients, and to analyze the natural course of plexiform neurofibroma (pNF) and clarify whether PET/CT is also useful for detecting tumors other than neurogenic tumors. PET/CT was prospectively imaged in 36 NF1 patients. There were 14 malignant peripheral nerve sheath tumors (MPNSTs) in 14 patients, and 54 pNFs in 30 patients. Nine patients had both MPNST and pNF. Maximal standardized uptake value (SUVmax) was significantly higher in MPNST (median 7.6: range 4.1-10.4) (P < .001) compared with that of pNF (median 3.7: range 1.6-9.3). The cut-off value of 5.8 resulted in a sensitivity of 78.6% and specificity of 88.9%. Median age was 29 y, and median maximum tumor diameter was 82 mm in 14 MPNST patients. The 5-y overall survival rate was 46.8%. Three patients with low-grade MPNST were alive without disease at the time of this report. In 9 patients in which pNF and MPNST co-existed, 2 showed a higher SUVmax of pNF than that of MPNST. Natural history analysis of pNF (n = 43) revealed that no factors significantly correlated with increased tumor size. Nine lesions other than neurogenic tumors were detected by PET/CT including 5 thyroid lesions and 3 malignant neoplasms. This study revealed the usefulness and limitation of PET/CT for NF1 patients. In the future, it will be necessary to study how to detect over time the malignant transformation of pNF to MPNST, via an intermediate tumor.     

18F-FDG PET/CT代谢参数及临床指标在弥漫性大B细胞淋巴瘤中期评估及预后预测中的意义

目的 探讨¹⁸F-氟代脱氧葡萄糖（¹⁸F-FDG）PET/CT的代谢参数及临床指标在弥漫性大B细胞淋巴瘤（DLBCL）中期评估及预后预测中的意义。方法 收集194例DLBCL患者临床资料,记录患者的中期评估结果,比较不同临床指标[β₂ -微球蛋白（β₂-MG）、双表达、三表达、Ann Arbor分期、淋巴瘤国际预后评分 （IPI）、多维尔5分法（D5PS）评分]和¹⁸F-FDG PET/CT代谢参数[最大标准化摄取值（SUV_max）、病灶累及部位SUV_max的总和（SUV_maxsum）、平均标准化摄取值（SUV_mean）和SUV_max下降幅度（△SUV_max）]中达完全缓解（CR）者所占比例的差异,应用Cox回归和Kaplan-Meier生存分析法分析¹⁸F-FDG PET/CT代谢参数及临床指标对DCBCL患者2年无进展生存期（PFS）的影响,并对SUV_max与β₂-MG、Ann Arbor分期和IPI评分进行相关性分析。结果 β₂-MG > 2.3 mg/L、Ann Arbor分期Ⅲ/Ⅳ期、IPI > 2分、SUV_max > 17.00和SUV_maxsum > 38.60者达CR的比例较低;疗效达CR者△SUV_max大于未达CR者（P均 < 0.05）。Cox单因素分析显示,β₂-MG、Ann Arbor分期、IPI评分、双表达、三表达、SUV_maxsum及D5PS评分均与DLBCL患者2年PFS有关（P均 < 0.05）;多因素分析显示,Ann Arbor分期Ⅲ/Ⅳ期（HR = 4.486,P = 0.001）为DLBCL患者2年PFS的独立危险因素,D5PS 评分1~3分（HR = 0.256,P < 0.001）为DLBCL患者2年PFS的独立保护因素。Spearman秩相关分析显示,SUV_max与β₂-MG（r_s = 0.348,P = 0.001）、Ann Arbor分期（r_s = 0.236,P = 0.022）和IPI评分（r_s = 0.305,P = 0.003）均有关。结论 ¹⁸F-FDG PET/CT的代谢参数与临床指标相关,Ann Arbor分期和D5PS可作为DLBCL患者预后的参考指标。     

Utility of Maximum Standard Uptake Value as a Predictor for Differentiating the Invasiveness of T1 Stage Pulmonary Adenocarcinoma

Background

The present study was performed to investigate the maximum standardized uptake value (SUVmax) in 2-[fluorine-18]-fluoro-2-deoxy-d-glucose (¹⁸F-FDG) positron emission tomography/computed tomography (PET/CT) to preoperatively distinguish invasive from less-invasive pulmonary adenocarcinoma.

Relation between neutrophil/lymphocyte ratio and primary tumor metabolic activity in patients with malign pleural mesothelioma

The aim of this study was to evaluate the relationship of the pre‐treatment blood neutrophil/lymphocyte count ratio (NLR) with the maximum standard uptake value (SUVmax) of primary masses on positron emission tomography/computed tomography (PET/CT) taken before treatment in patients diagnosed with malignant pleural mesothelioma (MPM) and to evaluate the contribution to prognosis. A retrospective evaluation was made of 73 patients diagnosed with MPM in our hospital between January 2006 and January 2014. The SUVmax value of the primary mass on pre‐treatment PET/CT, the haemogram parameters (Hb, Hct, NLR, MPV, PLT) at the time of diagnosis, the progression history, the date of the final visit, and the date of death of exitus patients was recorded from patient files PET/CT. The study group comprised 37 males (50.7%) with a mean age of 56.1 ± 11.4 years. The median survival time of these patients was 13 months. The survival time of the patient group aged <55 years was significantly longer (P = .006). Although the survival time of patients with NLR < 3 and SUVmax < 5 was longer, the difference was not statistically significant (P = .63, P = 0.08). A statistically significant difference was determined between the mean (or median) SUVmax values of the patient groups with NLR < 3 and NLR ≥3 (P = .019) with the SUVmax value of the NLR < 3 group found to be low. In conclusion, in patients with MPM, NLR ≥3 and high SUVmax values at the time of diagnosis can be considered an indicator of poor prognosis but are not a guide in the prediction of progression.